Unit 2 Section 1: Motion Practice Game

What is the term used to describe the change in position of an object?

• Speed

• Displacement

• Velocity

• Acceleration

Answer explanation

Displacement refers to the change in position of an object, measuring the shortest distance from the initial to the final position, while speed, velocity, and acceleration describe different aspects of motion.

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DOK Level 1: Recall

Which of the following is a scalar quantity?

• Velocity

• Displacement

• Speed

• Acceleration

Answer explanation

Speed is a scalar quantity as it only has magnitude and no direction. In contrast, velocity, displacement, and acceleration are vector quantities, which include both magnitude and direction.

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DOK Level 1: Recall

If a car travels 100 meters north and then 100 meters south, what is its total displacement?

• 0 meters

• 100 meters

• 200 meters

• 50 meters

Answer explanation

The car travels 100 meters north and then 100 meters south, returning to its starting point. Displacement measures the shortest distance from the initial to the final position, which is 0 meters.

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DOK Level 2: Skill/Concept

What is the average speed of an object that travels 150 meters in 30 seconds?

• 3 m/s

• 5 m/s

• 4 m/s

• 6 m/s

Answer explanation

To find the average speed, divide the distance by the time. Here, average speed = 150 meters / 30 seconds = 5 m/s. Thus, the correct answer is 5 m/s.

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DOK Level 2: Skill/Concept

Which graph best represents an object moving with constant velocity?

• A straight horizontal line

• A straight line with a positive slope

• A curved line

• A straight line with a negative slope

Answer explanation

An object moving with constant velocity has a consistent speed and direction, represented by a straight line. A straight line with a positive slope indicates constant positive velocity, making it the correct choice.

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DOK Level 2: Skill/Concept

What is the acceleration due to gravity on Earth?

• 8.9 m/s²

• 9.8 m/s²

• 10.8 m/s²

• 7.8 m/s²

Answer explanation

The acceleration due to gravity on Earth is approximately 9.8 m/s². This value is widely accepted in physics and is used for calculations involving gravitational force.

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DOK Level 1: Recall

Which of the following statements is true about vectors?

• Vectors have only magnitude.

• Vectors have only direction.

• Vectors have both magnitude and direction.

• Vectors have neither magnitude nor direction.

Answer explanation

Vectors are defined as quantities that possess both magnitude (size) and direction. Therefore, the correct statement is that vectors have both magnitude and direction.

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DOK Level 1: Recall

An object is thrown straight up into the air. What is its velocity at the highest point?

• 9.8 m/s

• 0 m/s

• -9.8 m/s

• 4.9 m/s

Answer explanation

At the highest point of its trajectory, the object's upward velocity becomes zero before it starts to fall back down. Therefore, the correct answer is 0 m/s.

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DOK Level 2: Skill/Concept

Which of the following is an example of a vector quantity?

• Temperature

• Mass

• Velocity

• Time

Answer explanation

Velocity is a vector quantity because it has both magnitude and direction, unlike temperature, mass, and time, which are scalar quantities that only have magnitude.

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DOK Level 1: Recall

What does the slope of a position-time graph represent?

• Speed

• Acceleration

• Displacement

• Velocity

Answer explanation

The slope of a position-time graph indicates how quickly an object changes its position over time, which is defined as velocity. Therefore, the correct answer is velocity.

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DOK Level 2: Skill/Concept